FYI the firmware utility is here:https://support.lenovo.com/ca/en/solutions/migr-64744
Since your model is not officially supported, it is better off with the BIOS whitelist, but I used that utility instead and it works great - as long as you know what you are doing. The autorun's success rate is not high and does not allow you to do anything else, so the better way is to dig inside and see which is the right version to run, start dos and run it there